ATC Summer camp at Manby. Went down the flight line during an 'off' period to look at aeroplanes and was invited to take a trip. I was alone down the back and we flew all over UK for several hours, doing touch and go landings at different airfields. I'd no idea which ones. It must have been a navigation exercise. Anyway, I spent a lot of the time standing on one of the trainee navigator's seats with my head in an astrodome, even during the roller landings. When we got back our CO went potty as he didn't know where I'd gone and I'd been reported missing - no-one but the crew knew I was aboard!
I was surprised to discover recently that RAF Manby had a grass field with no concrete runways.